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CHAPTER 9 PARE NT-C HILD RELATION SHIPS
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All child objects maintain a reference to their immediate parent object. This reference is declared in BusinessBase as NonSerialized and NotUndoable: <NotUndoable()> _ <NonSerialized()> _ Private _parent As Core.IParent The BinaryFormatter and NetDataContractSerializer can handle circular references in an object graph, so I could get away without the NonSerialized attribute. However, it has been observed that circular references in an object graph cause a substantial increase in the size of the byte stream that contains the serialized data. By using the NonSerialized attribute, I am reducing the size of the serialized data that is often transferred over the network in client/server scenarios. The NotUndoable attribute is absolutely required. As you ll see in 13, the n-level undo support in CSLA .NET doesn t handle circular references, so if this attribute is missing, n-level undo would go into an infinite loop, resulting in a stack overflow exception. Notice that the field type is IParent from the Csla.Core namespace. All parent objects are required to implement the IParent interface to enable interaction between the child and the parent. I discuss IParent later in this chapter. The Parent property in BusinessBase is of this type as well: <EditorBrowsable(EditorBrowsableState.Advanced)> _ Protected ReadOnly Property Parent() As Core.IParent Get Return _parent End Get End Property There s also a SetParent() method, which is invoked by the parent object to set the reference: Friend Sub SetParent(ByVal parent As Core.IParent) _parent = parent End Sub This method is invoked by LoadPropertyValue() when the child object is set into a managed backing field. And it is invoked when the parent object is deserialized. Remember that the _parent field is NonSerialized, so when the child is deserialized, the value is Nothing. It must be restored to a meaningful value once deserialization is complete, and that occurs in the parent object s FieldDataDeserialized() method, which is invoked by the OnDeserializedHandler() method. The result is that a child object can always get a reference to its immediate parent through its Parent property. This reference is used automatically in some cases, as I discuss later in the Parent Editable Collection section.
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The n-level undo functionality of CSLA .NET is discussed in detail in 13. It is also discussed to some degree in 10 because n-level undo is used to provide important functionality for data binding. There are several points in n-level undo and data binding, where parent and child objects must interact with each other. I won t discuss the details here; you can refer to s 10 and 13.
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The IParent interface, declared in Csla.Core, allows a child object to interact with its parent: Public Interface IParent Sub RemoveChild(ByVal child As Core.IEditableBusinessObject) Sub ApplyEditChild(ByVal child As Core.IEditableBusinessObject) End Interface The RemoveChild() method is used by the data binding functionality discussed in 10. There are scenarios where data binding informs a child object that it has been removed or deleted and the child then must ask its parent to remove its reference to the child object. The ApplyEditChild() method is used for interaction with the EditableRootListBase class, again triggered by data binding, so the parent collection can be notified that a child object s changes should be committed. Perhaps more important than these two methods is that the IParent interface provides a consistent type that is used by any child object when maintaining a reference to its immediate parent object. At this point, you should have a high-level understanding of the features that CSLA .NET automatically provides when a child object reference is contained in a managed backing field. If you choose to use a Private backing field to maintain a child object reference, you should make sure you replicate these behaviors as part of your implementation. Again, I recommend using managed backing fields to avoid having to do all that work.
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